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FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information
Contingent consideration liabilities	$ 75.2	$ 75.2		$ 32.7
Payment of contingent consideration liabilities		7.1	$ 2.2
Chi-X Asia Pacific
Segment Reporting Information
Payment of contingent consideration liabilities	0.6
Recurring
Segment Reporting Information
Contingent consideration liabilities	$ 75.2	$ 75.2		$ 32.7

X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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